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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e786f96f075ed3ae82978e8b38d5dc9e0da2c7a7293c34ab7820c7e6dbd410f4' 
  AND token = 'zXvC4JO3bdY7P57T8EPPdh0ik0gymnE2UkmFG1p8BA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}